Keyboard
1 The ON-OFF KEY is a dual purpose switch for both the ON and OFF positions. (Note: the
OFF position automatically clears all stored data and instructions.)
2 The ERROR (reel) LIGHT lights when the computer is turned on, and whenever the
computer detects an operational error; e.g. exceeding capacity, division by zero.
3 The GENERAL RESET KEY erases all data and instructions from the computer and turns off
the error light.
4 The CORRECT PERFORMANCE (green) LIGHT indicates the computer is functioning
properly. A steady light indicates that the computer is ready for an operator decision; a
flickering light indicates the computer is executing programmed instructions and that the
keyboard is locked.
5 The DECIMAL WHEEL determines the number of decimal places to which computations will
be carried out in the A register and the decimal places in the printed output, except for results
from the R register.
8 The RECORD PROGRAM SWITCH, when ON (in), directs the computer to store
instructions either in the memory from the keyboard, or onto a magnetic program card from
the memory.
The RECORD PROGRAM SWITCH must be OFF (out) to load instructions from a magnetic
program card into the memory.
7 The PRINT PROGRAM SWITCH, when ON (in), directs the computer to print out the
instructions stored in memory from its present location in the program to the next Stop
instruction (5), whenever the Print key (20) is depressed.
8 The MAGNETIC PROGRAM CARD is a plastic card with a ferrous oxide backing, used to
record programs magnetically for external storage. The card is inserted into a read/write
device (9) to record instructions and/or constants into or from the computer memory. Once
inserted, the card may be removed from the computer (10) without disturbing the stored
instructions.
(Note: the read/write device uses only half the magnetic card; consequently, two sets of 120
instructions and/or constants may be stored on a single card.) 11 The KEYBOARD RELEASE
KEY reactivates a locked keyboard. If two or more keys are depressed simultaneously, the
keyboard will lock to indicate a misoperation. Because the operator does not know what entry
was accepted by the computer, after touching the Keyboard Release key the Clear Entry key
(16) MUST next be depressed and the complete figure re-entered.
12 TAPE ADVANCE advances the paper tape.
13 TAPE RELEASE LEVER enables precise finger-tip adjustment when changing tape rolls.
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